amygdaloidal


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Related to amygdaloidal: trachytic, spherulitic, Amygdules
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Synonyms for amygdaloidal

shaped like an almond

References in periodicals archive ?
Amygdaloidal or drop-shaped mounds on the lower surface of sandstone beds, which are 16-27 mm wide and 27-60 mm long, pointed on one side (drop-shaped) or both sides.
Within the pockets of the lower and middle amygdaloidal horizons, quartz, datolite and albite have covered glauberite, leaving behind rectangular epimorphs as hollow shells.
Newly studied zeolite specimens come from two places, both lying immediately below the road Bfeziny-Dobrna: (1) the upper locality is represented by exposures in the upper part of the incised lava flow (vesicular and amygdaloidal facies) and (2) the lower locality near the building at an abandoned dam (both vesicular and massive varieties) represents the lower part of the same lava flow, however, subjected to landsliding.
Two lenticular bodies of porphyritic and amygdaloidal basalt are found intercalated within the Hyaloclastite mudstone units of the Bagh complex (Siddiqui et al.
Figures 5a and 5b show a typical prehnite-pumpellyite subfacies assemblage in amygdaloidal basalt.
The lowermost 8 meters of the basalt contain four types of mineralized structures: (1) pillow lava, (2) scoria (3) amygdaloidal basalt and (4) veins.
The bedrock of the profile U-II is a marginal analcime-phyric facies of the phonolite laccolith that grades into amygdaloidal natrolite-sodalite phonolite in the laccolith centre.
Andesitic volcaniclastic rocks and locally amygdaloidal coherent lavas or sills have also been mapped in the area.
The study area is geologically covered by Deccan trap rocks from the Cretaceous to the lower Eocene age, consisting of amygdaloidal and vesicular basalts.
1990) have described one of the dike rocks in the alcove in the quarry as an "altered amygdaloidal basalt.
Massive amygdaloidal and porphyritic basalts occur in the northeastern and central regions of the study area.
The Taurus property and surrounding area are underlain by an upright sequence of Division II massive to pillowed to rarely amygdaloidal, medium grey-green basaltic flows, chert and argillite, occasional ultramafic flows or sills, and mafic and lamprophyre dykes.
While the overlying aa makes excellent building stone, the pahoehoe beneath it is unsuitable for building because it is too soft, amygdaloidal, and full of mineralized vesicles.
The UFU, of minimum 100 m thickness, is again dominated by massive, columnar-jointed, medium-grained basalt containing <20-30% mesostasis, and with minor amygdaloidal zones containing zeolite minerals.